Decomposition characteristics of pineapple plant residues returned to the soil in different ditches
Returning straw to soil in ditches can increase soil temperature,nutrients and organic matter content,change soil microbial community composition,and thus increase crop yield.However,this method has not been reported to use in returning pineapple plant residues to soil in the field.Five treatments for ditching and returning the pineapple plant residues to the soil in the field were designed:Ditching 10 cm deep,returning the plant residues into soil in the ditches,ridging and covering with film(DRF10);ditching 20 cm deep,returning the plant residues to the soil in the ditches,ridging and covering with film(DRF20);ditching 30 cm deep,returning the plant residues to the soil in the ditches,ridging and covering with film(DRF30);ditching 30 cm deep,returning the plant residues into the soil in the ditches and ridging(DR30);ditching 30 cm deep,returning the plant residues into the soil in the ditches and leveling(DL30).The decomposition characteristics of the pineapple plant residues buried in different ditches were observed and analyzed.The results showed that the decomposition of the pineapple plant residues mainly occurred in the first 60 days after they were returned to the soil,with a decomposition rate of more than 56％.The decomposition rate of the plant residues was the highest at 15-30 days after returning to the soil.In the DRF20 treatment,the cellulose release rate and decomposition rate were significantly higher at 15 days after returning to the field,and the lignin release rate and decomposition rate were also the highest after 30 days of returning to the soil.The decomposition and decomposition rate,release rate of cellulose and hemicellulose were significantly lower in the DRF30 treatment than in the other treatments.The lignin release rate and decomposition rate were significantly higher in the DRF30 treatment than the other treatments at 540 days after returning to the soil.Soil water content and temperature were higher in the DRF30 treatment than in the DR30 and DL30 treatments.The enzyme activities were higher in the DRF30,DR30 and DC30 treatments than in the other treatments,but not significantly.The decomposition rate of the pineapple plant residues was positively correlated with the release rate of cellulose and lignin and negatively correlated with phosphatase.In conclusion,the pineapple plant residues decomposed fast at the early stage in the DRF20 treatment but at the middle and late stages in the DRF30 treatment.
pineapple plant residuesreturning of plant residues to the fielddecomposition characteristicssoil characteristics
万方数据
维普
